Sand-molding machine



(No Model.)

4 Sheets-Sheet 1.

T. MISTELSKI.

SAND MOLDING MACHINE.

' Patented June 24, 1890.

WITNESSES INVENTOR (No Model.) 4 Sheets-Sheet 2.

T. MISTELSKI. SAND MOLDING MACHINE.

- No.430,666. A PatentedJune24,1890u WITNESSES INVENTOR THE News PETERsca, move-mum, msmuc'rcu, u. c.

(No Model.) 4 Sheets-Sheet 3.

T. MISTELSKI.

SAND MOLDING MACHINE.

No. 430,666. Patented June 24, 1890.

(No Model.) 4 Sheets-Sheet 4. T. MISTELSKI.

SAND MOLDING MAUHINE. No. 430,666. Patented June 24, 1890.

WHTNESSES T0 whom it may concern:

I UNITED STATE-S PATENT ()FFICE.

THEODOR MISTELSKI, OF ALLEGHENY, PENNSYLVANIA.

SAND-MOLDING MACHINE.

SPECIFICATION forming part of Letters Patent No. 430,666, dated June 24,1890.

Application filed March 12, 1890- Serial No. 343,602. (No model.)

Be itknown that I, THEODOR MISTELSKI, a citizen of the United States,residing at Allegheny, in the county of Allegheny and State ofPennsylvania, have invented certain new and useful Improvements inSand-Molding Machines; and I do hereby declare the following to be afull, clear, and exact description of the invention, such as will enableothers skilled in the art to which it pertains to make and use the same,reference being had to the accompanying drawings, which form a part ofthis specification.

My invention relates to machines for molding molds for casting, and moreespeciallyto that class of such machines in which the flask is broughtunder a platen which compresses and packs the sand around the pattern,the flask being then removed from under the platen and the patternwithdrawn.

My invention consists, first, in the combination, with a stationarysupport for the platen, of a reciprocating carriage, upon which aremount-ed the tables on which the flasks are placed; second, in means formoving the carriage back and forth under the platen and for stopping itautomatically or otherwise at any desired point in its travel; third, ina table for supporting the flask, made adjustable to suit flasks ofdifferent sizes; fourth, in a movable banking-frame adapted to beapplied to a flask at either side of the platen and to move with theflask when the carriage is operated, and,fifth, in certain details ofconstruction and arrangement that will be hereinafter set forth, andparticularly pointed out in the claims.

In the drawings, Figure l is a side elevation of my improved machine.Fig. 2 is an end view, certain parts being shown in crosssection. Fig. 3is a plan of the banking-frame and its guides. Fig. i is a perspectiveview of the bed. Fig. 5 is a longitudinal section of one of the tables.Fig. 6 is a plan view of the mechanism for enlarging or contracting thetables. Fig. 7 is a longitudinal section of the carriage; and Fig. 8 isa cross-section thereof, showing the same mechanism.

The same letters and numerals of reference are used in all figures.

The bed A is a solid rectangular casting,

resembling an open box. It maybe stifiened by transverse partitions a.Lugs a are cast integral with the bed, projecting from each side andatoppositely-disposed points, preferably in line with the partitions a. Ina hole in each lug is stepped a standard B, which is preferably a stoutround rod threaded at its lower end, and firmly fastened in the lug bythe nuts I). A head or collar integral with the rod may take the placeof the lower or upper nut, respectively, or any other convenient mode offastening the standard may be adopted. The standards are preferably fourin number, and rise parallel with each. other to a suitable height abovethe bed. Their upper ends pass through eyes in a plate C, which can beadjusted vertically on the standards, preferably by means of nuts 0above and below the eyes, the upper portion of the standards beingscrew-threaded to receive said nuts. The plate supports a verticalcylinder 1, preferably cast in one piece with it. A head 0' is securedto the upper end of the cylinder, and within it is fitted a piston D,whose piston-rod D passes downward through a stuffing-box c beneath theplate 0. To the end of the piston-rod is fastened a movable cross headE, consisting of a plate having perforated lugs e, that slide on thestandards B and guide it in its vertical movements. A box F is securedon the under side of the plate by means of bolts passing through aflange f. The sides of the box may slope inward slightly, as shown, andits bottom is composed of a sheet of rubber or other suitable flexiblematerial F, which is clamped to the edge of the box by means of a framef and bolts or screws f A pipe G, passing through the cross-head E tothe interior of the box F, enables the box to be filled with water orother liquid, after which a valve in the pipe can be closed to confinethe liquid and cause it to form an incompressible but mobile backing forthe flexible sheet F. When this platen is forced down upon the sand in aflask, the sand is packed tight-1y around the pattern with an evenuniform pressure, due to the fact that the sheet F will yield where thesand is harder on the pattern nearer the surface, and

will bulge out and follow up the sand in those places where it is softeror deeper, thereby packing it to the same density at all points.

In-order to raise and lower the platen and cause it to exert a pressureupon the sand, a pipe H conveys compressed air, steam, or other fluidunder pressure to the cylinder C through the branches 7th, onedelivering the fluid-pressure above the piston D and the otherunderneath it. The fluid is directed into the desired branch pipe bymeans a fourway cock H, located at the junction of the branches with themain pipe. By turning the cock to one position the piston and platenwill be raised. On turning the cock to another position the piston willbe depressed, forcing the platen down upon the mold. The constructionand operation of the four-way cock are so well known that they need notbe described here in detail. A gage I indicates the pressure in thecylinder above the piston.

Turning now to the devices by which the flasks are brought under theplaten and removed therefrom, it may be said that this comprises areciprocating carriage, on which are erected tables for supporting theflasks, the carriage being moved by a piston in a longcylinder, and thetables being adj ustable in length. Inside of each table is avertically-moving cross-head, to which the pat tern is attached.

In the drawings, the carriage K appears as arectangularopen frame or boxhaving projecting flanges is along the lower edges of its.

sides, which are received in grooves a formed along the upper edges ofthe sides of the bed A, andserving as ways in which the carriage slides.WVithin the bed is a cylinder A of suitable length, disposedlongitudinally of the bed, and preferably cast integral therewith. Apiston in the cylinder is provided with a piston-rod L, which extendsthrough a slot a inthe end ofthe bed, and is secured to an arm is,depending from one end of the carriage vK. A pipe M conveys steam,compressed air, or the like to a four-way cock M, which directs it intoone or the other of two branches m m, leading, respectively, to thefront and rearv ends of the cylinder A, the exhaust-fluid escapingthrough the branch m The spindle of the valve Mextends out through thebed A, and is provided with an upright rock-arm M and a horizontal one MBy manipulating the cock M the carriage. K,

can be reciprocated to bring either of the tables N under the platen.

Each table is composed of two end portions 12 n, separated by anintermediate removable portion n. The end portions consist of boxeshaving two sides, one end, and a bottom, the latter extending beyond thesides to form flanges 12 that fit into the grooves 78, formed along theinside of the carriage K at its upper edges. Depending from the bottomof each portion n 'n is a lug 01. in which is a screw-threaded hole, onehaving a right-hand and the other a left-hand thread. A shaft 0 extendslongitudinally through the carriage,

screw is rotated.

being suitably journaled in bearings in the ends of the carriage and inits transverse stiffening-webs k The shaft is reduced in diameter at oneend, as shown, from a point about midway of the table N, andisscrewthreaded on both the larger and smaller portions, the threads beingalternately right hand and left hand, as shown. This screwshaft engagesthe lugs n on the several end portions of the tables, the reduceddiameter of the end of the shaft permitting the inner lug n to slipfreely over it when the parts are assembled until it reaches its ownlarger thread. The shaft may be provided at one end with a squaredportion, as shown in Fig. 5, for the application of a wrench orcrankhandle to rotate it when the tables are to be altered in size.might at times require considerable power I prefer the constructionillustrated in Figs. 6, 7, and 8, in which is shown an arrangement ofgearing for rotating the shaft.

At some convenient point on the shaft, preferably between the webs W, aworm-gear o is secured to it, which meshes with a worm 0 on a transverseshaft 0, suitably journaled in the sides of the carriage. One end of theshaft 0 protrudes sufficiently to allow a removable winch orcrank-handle O to be applied to it .when desired. Uponturningtheworm-shaftO the screw-shaft 0 will be rotated and the endportions of the tables will be separated or caused to approach eachother simultaneously, according to the direction in which the When theparts have been properly adjusted, they can be clamped in position bymeans of the set-screws k impinging upon the flanges 01 The intermediateremovable portions n have no bottoms nor any flange to enter the groovesThey are made in sets of different widths, corresponding with thedifferent sizes to be given to the tables. They are fastened to the endportions by bolts that pass through registering-lugs formed on themeetingedges of the end portions and removable portions, as clearlyshown in Figs. 1 and 2. The top of the table is a plate N, and may beprovided with a depending flange n to fit over the outside of theportions 71 n. Plates of various sizes are necessary, and in each is cutan aperture n corresponding with the shape of the pattern, since thetable-top operates as a strippingplate, through which the patternisprojected and Withdrawn.

The pattern is fastened on a platform P, a set of which is provided ofdifferent sizes corresponding to the sizes that can be given to thetables. This platform P is removably secured to the upper ends of posts19, which rise from the ends of a cross-head P, arranged to slide invertical guides Q on the inside of the carriage K. The posts 19 pass upbetween the bottoms of the two end portions 11. n of the table alongsideof the removable portions 01. The cross-head may be suitably cut away toavoid striking the screw 0 when raised. The

travel of the cross-head must be enough to withdraw the pattern Z fromthe mold.

To operate the cross-head, it is provided at each end with a wrist-pinp, which projects through a vertical slot 70 in the side of the carriageK. Each pin is connected by alink 'r'with an arm 1 of a T-shaped rockerR, keyed 0n the end of a rock-shaft R ,which is mounted in bearings inthe sides of the carriage across which it extends. A second rock-shaft Sis arranged transversely of the carriage near the rock-shaft R, and isprovided with a leverhandle 8, and a rock-arm s',which is connected bythe link s with another arm 2 of the rocker R. Upon depressing thehandle 3 the crosshead P will be lowered, and vice versa. The

upright arm 3 of the rocker R is preferably connected with thecorresponding arm of the rocker at the opposite end of the carriage bymeans of a rod T, which is rendered adj ustable in length by aturn-buckle t. This connecting-rod enables the attendant to withdraw onepattern and raise the other simultaneously from either end of themachine.

I prefer to provide but one banking-frame U for the two tables, thoughit is evident that two may be used. To render one frame available forboth tables, it is support-ed on slides V, secured to the inner sides ofthe standards B and extending parallel with the bed A. The slidesconsist, preferably, of bars grooved on their inner faces to receive theblocks to, adapted to slide in the grooves. From each block projects apin 011 which is fulcrumed a lever U, one end of which is pivoted to thebanking-frame U at about the middle of one side. The other end of thelever carries an adjustable counter-balance u, the two being preferablyunited by a bar 10 On one side of the bankingframe are provided handlesa The frame itself is merely a rectangular boX with no top or bottom,preferably slightly smaller at the bottom, as shown. Pins it projectdownward from its lower edge to enter holes in the flask and cause theframe to register properly therewith. The construction' shown anddescribed permits it to be moved from one side of the compressingapparatus to the other, and to be raised and lowered at will. A lever TVis fulcrumed to the frame-work at some convenient placeas, for instance,one of the slides V-and is connected by a rod 10 with the horizontal armM on the spindle of the four-way cock M. A downward movement of the rodcauses the carriage to travel to the right, (see Fig. 1,) and viceversa.

To automatically arrest the motion of the carriage at any predeterminedpoint, it is provided with tappets to strike the rock-arm M at theproper instant and close the valve M. To stop it at either end of itsstroke, the rocker-arms 1 may be provided with toes 4, depending intothe line of the upright rock-arm M When the carriage approaches the endof its movement, the toe strikes the rock-arm and turns the cock M intoits intermediate in the middle of its travel with neither table underthe platen, this can be accomplished by means of a tappet X, consistingof a lever pivoted to the side of the carriage at the proper point, andhaving a toe an adapted to strike the rock-arm M The tappet is heldnormally in position to operate by means of a spring m; but the workmancan prevent it from acting by stepping on the treadle 50 and therebyholding the toe a: raised until it has passed over the rock-arm M Theoperation of my machine is as follows: The carriage K is placed at themiddle of its stroke with neither table under the platen. The twopatterns Zone forthe cope and the other for the dragare firmly securedto the platforms P, one of which is then raised to project the patternabove the table'top N. One part of the flasksay the cope-is then placedon the table around the pattern and is filled with sand. Thebanking-frame is then pulled out on the slides V and brought down uponthe cope, its pins 10 entering suitable holes in the upper edge thereof.The frame is filled with sand. The lever \V is then moved to open thefour-way cock M, whereby the carriage is automatically moved to bringthe cope und'er the platen, the banking frame moving with it by reasonof the blocks 1t sliding in the ways V. The table stops automaticallywhen it reaches the proper position for the compressing apparatus tooperate. The fourway cockl-I is then opened to admit fluidpressure abovethe piston. D, whichv forces down the yielding platen upon the sand inthe banking-frame, pushing it down into the cope, and packing it firmlyand with uniform end of its stroke to bring the drag under the platen.When the sand has been packed in this part of the flask, the carriage isreturned to its central position, and the drag-pattern is withdrawn fromits mold by depressing one of the levers 8, thereby elevating thecopepattern again for the formation of a new mold. The connecting-rod Tmay be omitted and each pattern manipulated independently, if desired.The cope and drag can now be removed to the foundry-floor and united forpouring in the usual manner.

To prevent sand from falling into the car- The banking-frame IIO .riageand bed, they may be floored over ho low the grooves k a respectively,suitable 1. In a sand-molding machine, the combination, with the bed A,of the cylinder A, cast integral therewith, a stationary compressingapparatus erected on' the bed at or near its middle, a carriagesupporting the molds and sliding on the bed, a piston in the cylinder,connected with said carriage, and a four-way valve controlling the flowof fluidpressure to the cylinder to cause the molds to move under andaway from the compressing apparatus at Will of the operator,substantially as described.

2. In a sand-molding machine, the combination, with the bed A, havingthe cylinder A longitudinally arranged therein, of a stationarycompressing apparatus supported by said bed, a carriage for the molds,sliding on the bed, a piston in'the cylinder, connected with thecarriage, a four-way valve controlling the flow of fluid-pressure to thecylinder, a handle for operating the valve at the will of the operator,and devices moving with the carriage, adapted to operate the valve atpredetermined points in the travel of the carriage, substantially asdescribed.

3. In a sand-molding machine, the combination, with the bed A,containing the cylin der A, of the carriage K, sliding on the bed andconnected with a piston in the cylinder, the valve M, controlling theadmission of fluid-pressure'to the cylinder and having its spindleprovided with the upright rock-arm M and tappets attached to thecarriage and adapted to strike the arm M substantially asdescribed.

4. In a sand-molding machine, the combination, with the cylindercontaining a piston, of a valve controlling the admission offluid-pressure to the cylinder and a carriage connected with the pistonand carrying the lever X, having the toe w and the spring w for holdingit normally in position to operate the valve, substantially asdescribed.

5. In a sand-molding machine, the combination, with the standards B, ofthe adjustable cylinder 0, the piston D, and piston-rod I), the plate E,sliding on the standards and connected with the piston-rod, the box F,secured to the under side of the plate and having inclined sides, andthe flexible bottom F, clamped to the lower edge of the box by the framef, substantially as described.

6. The combination, with the carriage K, of the table N, comprising twoadjustable end portions 47,- n, each having two sides and one end,intermediate removable portions 17., and

a removable flat top having an aperture for the passage of the pattern,substantially as described.

7. The combination. with the carriage K,

vhaving the grooves 762, of the tables having end portions 07. 01,provided with flanges n to slide in the grooves R and intermediateremovable flangeless portions 01, substantially as described.

8. The combination, with the carriage K, of the tables for supportingthe flasks, consisting of adjustable end portions n n, a set ofintermediate removable portions n, and a set of removable tops N,substantially as described.

forth.

10. The combination, with the carriage K, of the cross-head P, havingposts 1 and platform P, the table N, comprising two end portions n a 011either side of the posts 19, and

intermediate portions 07., adjacent to said posts, and means foradjusting the end portions, substantially as described.

11. Thecombination,withthecarriageK,of two vertically-movablecross-heads P, two rock-shafts R, carrying rockers R, having arms 1, 2,and 3, two rock-shafts S, with their handles and rock-arms, and anadjustable rod T, connecting the upright rocker-arms 3, substantially asdescribed.

12. In a sand-molding machine, the combination, With the bed andcylinder,. of the valve M, Whose spindle has an upright arm M thecarriage K, carrying the cross-heads P, and the rockers R for actuatingsaid crossheads, one arm of each rocker having a toe 4, adapted tostrike the arm M and automatically stop the carriage when it reaches theend of its stroke, substantially as described.

13. In a sand-molding machine, the combination, with the standards B, ofthe slides V, secured thereto, and a vertically-movable banking-frame U,supported on levers adapted to move along said slides, substantially asdescribed.

14. In a sand-molding machine, the combination, with the standards B, ofthe horizontal grooved bars V, secured thereto, the blocks a, sliding inthe grooves, the counterbalanced levers fulcrumed on said blocks, andthe banking-frame U, pivoted to said levers, su bstantially asdescribed.

THEODOR MISTELSKI. Witnesses:

F. WVEsTPHAL,

JoHN VON OHLEN.

